91. Which one of the following chemicals helps in fruit ripening?

1. Ethephon
2. Atrazine
3. Isoproturan
4. Malathion

Option “A” is correct
The Chemical Ethephon is often used on wheat, coffee, tobacco, cotton and rice in order to help the plant’s fruit to ripen more quickly.
92. Which of the following is not a Natural polymer?

1. Wool
2. Silk
3. Leather
4. Nylon

Option “D” is correct
Wool, silk, leather are the natural polymers but nylon is not a natural polymer.
93. Which one of the following chemicals had been in use till now for making artificial clouds?

1. Potassium Nitrate
2. Heavy Water
3. Sulphur Iodide
4. Silver Iodide

Option “D” is correct
Cloud seeding is the process of spreading either dry ice or more commonly silver Iodide into the upper part of clouds to try to stimulate the precipitation process and form rain.
94. ___________ Gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.

1. Hydrogen
2. Nitrogen
3. Carbon dioxide
4. Ozone

Option “C” is correct
A greenhouse gases are combination of gases in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.The main Greenhouse Gases are Carbon di oxide, Methane, Ozone, Water vapour etc.
95. Metals react with sodium hydroxide to produce ___________.

1. Oxygen gas
2. Sodium
3. Water
4. Hydrogen gas

Option “D” is correct
Sodium hydroxide reacts with metal to release hydrogen gas. The metal takes the oxygen atom from sodium hydroxide, which in turn takes the oxygen atom from the water, and releases the two hydrogen atoms. The reaction thus produces hydrogen gas.
96. Which base is present in lime water?

1. Sodium hydroxide
2. Magnesium hydroxide
3. Calcium hydroxide
4. Ammonium hydroxide

Option “C” is correct
Calcium hydroxide base is present in lime water.
97. Chemical formula for Sulphurous acid is:

1.H2SO4
2.H2SO3
3.H3SO3
4.H3SO4

Option “B” is correct
Sulfurous acid is the chemical compound with the formula H₂SO₃.
98. Brownish film formed on iron when left in open is called?

1. Dust
2. Shovel
3. Spade
4. Rust

Option “D” is correct
When iron is exposed to water or air over a period of time, the iron reacts with oxygen in the presence of moisture to form a reddish-brown chemical compound, iron oxide. This is referred to as rust.
99. The substances which have very low ignition temperature and can easily catch fire with a flame are called _____________ substances.

1. Hazardous
2. Perilous
3. Incombustible
4. Inflammable

Option “D” is correct
The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquified Petroleum Gas (LPG), etc.
100. Which of the following main elements is used in making matchbox?

1. Graphite
2. Phosphorous
3. Silicon
4. Sodium

Option “B” is correct
The safety matchbox ignites due to the extreme reactivity of phosphorus with the potassium chlorate on the match head. Phosphorus is a highly reactive, non-toxic-chemical used for making the head of a matchstick.

166 thoughts on “Chemistry”

  1. I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

  2. ¡Hola, seguidores del entretenimiento !
    Mejores casinos online extranjeros con pagos sin registro – п»їhttps://casinoextranjerosespana.es/ mejores casinos online extranjeros
    ¡Que disfrutes de asombrosas premios extraordinarios !

  3. ¡Hola, entusiastas de la suerte !
    casinoonlinefueradeespanol con ofertas flash – п»їп»їhttps://casinoonlinefueradeespanol.xyz/ casinos online fuera de espaГ±a
    ¡Que disfrutes de asombrosas premios extraordinarios !

  4. ¡Hola, usuarios de sitios de juego !
    Casino sin licencia espaГ±ola sin esperas – п»їcasinossinlicenciaespana.es casino online sin licencia espaГ±a
    ¡Que experimentes instantes únicos !

  5. ¡Saludos, apostadores apasionados !
    Opiniones reales sobre casinos online extranjeros 2025 – п»їhttps://casinoextranjerosenespana.es/ casinos extranjeros
    ¡Que disfrutes de instantes irrepetibles !

  6. Предлагаем вашему вниманию интересную справочную статью, в которой собраны ключевые моменты и нюансы по актуальным вопросам. Эта информация будет полезна как для профессионалов, так и для тех, кто только начинает изучать тему. Узнайте ответы на важные вопросы и расширьте свои знания!
    Получить дополнительные сведения – https://nakroklinikatest.ru/

  7. ¡Bienvenidos, buscadores de éxitos!
    Casino por fuera con tragamonedas exclusivas – п»їhttps://casinoporfuera.guru/ casino por fuera
    ¡Que disfrutes de maravillosas tiradas afortunadas !

  8. Alfredsheni

    ¡Hola, descubridores de oportunidades!
    Casino online extranjero con juegos licenciados internacionalmente – п»їhttps://casinoextranjero.es/ casinos extranjeros
    ¡Que vivas éxitos notables !

  9. Marvinsudge

    ¡Hola, usuarios de sitios de apuestas !
    Casino online extranjero con soporte multilingГјe – п»їhttps://casinoextranjero.es/ mejores casinos online extranjeros
    ¡Que vivas premios extraordinarios !

  10. gloriaabelardo

    Personally I don’t think the criticism really sticks these days. In watchmaking as in everything else people copy you can say “are link influenced by” if you want some people do and hell if we had an Infinity Gauntlet and did a Snap on every watch that is obviously influenced by the Royal Oak we’d have a lot of dust in the air.

  11. murieldjayne

    Everything about the new GRNR for lack of a consensus nickname link yet is basically like every other 126710. The stainless steel case is 40mm by 12mm and the watch comes with choice of Jubilee or Oyster bracelet. The watch is powered by a caliber 3285 with 70 hours of power reserve and has the independent jumping hour hand to skip time zones when you travel from place to place.

  12. habibadwagner

    Brand AutodromoModel Group B S2 Corsica BlueDiameter 39mm Case Material Titanium and steelDial Color BlueIndexes PinkLume Yes on hands and hour link markersWater Resistance 50 metersStrapBracelet Steel bracelet can be removed for the use of a traditional two-piece strap

  13. ubetoraizelb

    Skull form watches have never really made a third comeback partly because they’re impractical to carry and partly because pocket watches these days are a niche of link a niche the annual production of pocket watches from high-end makers like Patek AP and Vacheron is a drop in the ocean of wristwatches that come out of Switzerland every year. However watches with skulls on the dial or otherwise incorporated into the design of a watch are in the catalogue of several brands.

  14. ¡Saludos, usuarios de plataformas de juego !
    Mejores casinos por fuera con bonos sin rollover – п»їhttps://casinosonlinefueraespanol.xyz/ casinosonlinefueraespanol
    ¡Que disfrutes de movidas extraordinarias !

  15. ?Hola, exploradores del azar !
    Casino online fuera de EspaГ±a para jugar sin VPN – п»їhttps://casinosonlinefueradeespanol.xyz/ casinosonlinefueradeespanol
    ?Que disfrutes de asombrosas premios excepcionales !

  16. Hello trailblazers of refreshing atmospheres !
    Air Purifiers for Smoke – High-Tech Units 2025 – п»їhttps://bestairpurifierforcigarettesmoke.guru/ best air purifier for smoke
    May you experience remarkable magnificent freshness !

  17. ¡Saludos, entusiastas del éxito !
    Casino sin licencia para nuevos jugadores – п»їaudio-factory.es casino online sin licencia espaГ±a
    ¡Que disfrutes de asombrosas botes sorprendentes!

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top